A teacher was arrested and accused of putting sleeping pills into toddler’s sippy cups at the Northern California preschool where she worked. 59-year-old Debbi Gratz was charged with child endangerment. She has been released from custody and is scheduled to appear in court again later this month.

She was arrested after a colleague at the Morgan Hill Kiddie Academy saw her put an unknown substance into the children’s cups. School officials called police, who said Gratz admitted putting the over-the-counter sleeping aid “Sominex” into the kids’ drinks.

Fortunately, none of the children drank from the cups the day the incident occurred.